| 川北中三叠统沉积层序特征及陡坡封闭型镶边台地模式 |
| |
| 引用本文： | 彭博,李国蓉,罗鹏,沈忠民,赵应权,姚尚胜.川北中三叠统沉积层序特征及陡坡封闭型镶边台地模式[J].海相油气地质,2012(2):26-33. |
| |
| 作者姓名： | 彭博 李国蓉 罗鹏 沈忠民 赵应权 姚尚胜 |
| |
| 作者单位： | 成都理工大学能源学院;成都理工大学"油气藏地质及开发工程"国家重点实验室;中国石化西北油田分公司;华北油田二连公司地质研究所 |
| |
| 基金项目： | 国家科技重大专项“海相碳酸盐岩层系大中型油气田分布规律及勘探评价”(2011ZX05005-002)资助 |
| |
| 摘 要： | 川北地区中三叠统层序地层学的对比研究表明,雷口坡组顶界面(T2/T1界面)和底界面(T3/T2界面)具有横向分异规律,由此识别出2个Ⅲ级层序,其上部SQ2层序普遍缺失高水位体系域。层序地层格架内的岩相古地理分析表明,该区中三叠世长期处于蒸发台地、局限台地环境,碳酸盐岩颗粒结构欠发育,可见少量藻屑颗粒灰岩和白云岩、细—中晶白云岩,缺少生物礁标志,藻席大量发育,白云石化作用强烈。识别出了工农镇剖面斜坡角砾,并对台地边缘位置进行了厘定。根据沉积及岩石学研究结果,得出了川北地区中三叠统典型的陡坡封闭型镶边台地模式。
|
| 关 键 词： | 中三叠统 碳酸盐岩 沉积特征 层序地层学 沉积模式 四川盆地中部 |
Characteristics of Middle Triassic Sedimentary Sequence and the Model of Steep-sloped Enclosed Rimmed Platform Facies,Northern Sichuan Basin |
| |
| Peng Bo,Li Guorong,Luo Peng,Shen Zhongmin,Zhao Yingquan,Yao Shangsheng.Characteristics of Middle Triassic Sedimentary Sequence and the Model of Steep-sloped Enclosed Rimmed Platform Facies,Northern Sichuan Basin[J].Marine Origin Petroleum Geology,2012(2):26-33. |
| |
| Authors: | Peng Bo Li Guorong Luo Peng Shen Zhongmin Zhao Yingquan Yao Shangsheng |
| |
| Institution: | the Faculty of Energy,Chengdu University of Technology,1 Dongsan Rd.,Erxianqiao,Chengdu,Sichuan,610059,China |
| |
| Abstract: | The characteristic correlation of sequence stratigraphy has indicated that there is a differentiation regulation in lateral at the top surface(the T2/T1) and the bottom surface(the T3/T2) of Middle Triassic Leikoupo Formation in lithology in northern Sichuan Basin.Therefore,two Ⅲ-order sequences are identified,in which the high-level system tract(HST) is generally absent in SQ2,the upper subsequence.Based on analysis of lithofacies palaeogeography in the Ⅲ-order sequence stratigraphic framework,it is shown that the environments of evaporative carbonate platform and restricted platform was dominant for a long time during the middle Triassic epoch in northern Sichuan Basin so that the underdeveloping carbonate grain textures indicate lack of mark of reefs but abundant algal mats,which results in existence of a little algal-clastic grainstone and dolostone and fine-to medium-crystalline dolostone.A sort of slope facies breccia is recognized at Gongnong Zhen outcrop.The location of platform margin is confirmed.According to the research results of sedimentology and lithology,a typical model of Middle Triassic steep-sloped enclosed rimmed platform Facies in epicontinental sea is s recommended for the northern Sichuan Basin. |
| |
| Keywords: | Middle Triassic Carbonate rock Sedimentary characteristics Sequence stratigraphy Sedimentary model Central part of Sichuan Basin |
| 本文献已被 CNKI 等数据库收录！ |
|
